Fire extinguisher



FIG. 1 is a front elevation view of a fire extinguisher showing our new design;

FIG. 2 is a side elevation view thereof; the opposite view of FIG. 2 is a mirror image of that shown;

FIG. 3 is a rear elevation view thereof; and

FIG. 4 is a top plan view thereof. 

The ornamental design for a fire extinguisher, as shown and described. 